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Massively parallel single-machine supercomputers are still, essentially, distributed systems on the inside. You still have to use many of the same techniques to avoid communicating all-to-all. If you treat such a system as a flat memory hierarchy, your application will fall down.



True that they're still essentially distributed systems on the inside, but the typical bandwidth can often be orders of magnitudes higher, and the latencies drastically lower when you need to cross those boundaries, and for quite a few types of apps that makes all the difference in the world to how you'd architect your apps.

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